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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> resistor TC https://designers-guide.org/forum/YaBB.pl?num=1150617740 Message started by microe on Jun 18th, 2006, 1:02am |
Title: resistor TC Post by microe on Jun 18th, 2006, 1:02am I see in some process documents that N+ poly resistor has a negative Temperature coefficient while P+ poly resistor has a positive TC. What is the physical reason of that? Is it possible to have N+ poly with positive TC or P+ poly with negative TC? Thanks. |
Title: Re: resistor TC Post by jhuang on Jul 28th, 2006, 1:45pm From the device physics, the resistance is inversely proportional to both mobility and carrier concentration. The mobility has a negative TC while the carrier concentration has a positive TC. So it all depends on which is dominant or more specifically the sheet resistance. I actually used such a process with NTC from p-poly and PTC from n-poly. |
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